Observed correlations between the fundamental cyclotron line energy and luminosity as a result of the pulse-amplitude-resolved analysis (gray crosses). The blue crosses are the correlations corrected for the time drift. The green line is the best fit model to the blue crosses, which reflect the Ecyc ∕Lx dependence corrected for the time drift. The reference time corresponds to the beginning of the giant outburst. The data of the 2016 outburst are marked as the magenta crosses.
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